He found that even though he has liked 150 brands — many more than the average user — sponsored or commercial content was still a small minority of what makes it into his news feed. He produced a super-vertical graphic of his news feed (that looks to be several feet long if it were actual size) and divided it into friends' posts, organic posts from brands, and sponsored posts.

Here's the summary: only 16% of posts are from brands, and only 3% are paid ads. Everything else on Facebook is stuff from friends.

Rob Lethearn, Optimal

And here — get ready to start scrolling! — is a vertical image of his news feed, demarcated by ads, brand posts and friend posts: